Method for calibrating characteristic waves of power network by utilizing clock stamp

Abstract

The invention discloses a method for calibrating characteristic waves of a power network by utilizing clock stamps, including the following steps: firstly, the waveform of voltage current of the power network is sampled, and the sampling value of stray voltage current is obtained; satellite signals are received during sampling, standard time information is generated and is maintained and processed, and the time of occurrence of an interrupt signal during sampling is recorded so as to form the clock stamp; secondly, Fourier transform is carried out on the sampling value of the stray voltage current, and the amplitude and the phase positions of fundamental and higher harmonics are obtained; thirdly, sampling instant high-accuracy clock stamps are added to the obtained amplitude and the phase positions of the fundamental and higher harmonics so as to form and transmit a data packet to other sites of the power network. The invention utilizes satellites for time synchronization so as to provide a uniform, high-accuracy and high-precision signal source for a vast geographical region, thereby eliminating the disadvantages of low accuracy of time synchronization, difficult data comparison, high data transmission quantity, and the like of a wide area network.

Description

technical field [0001] The invention relates to a method for calibrating voltage and current waveforms, in particular to a method for calibrating voltage and current waveforms by using a standard clock stamp, which is applied in the field of power systems, and relates to a method for implementing the method. system. Background technique [0002] Traditionally, the cornerstone of power system relay protection is the various components of the system, mainly referring to lines, busbars, transformers, etc., which constitute a linear time-invariant system. Knowing the impulse response function of a component, you can know the voltage at any time. If the shock response function is known, all the behavioral characteristics of the component are known; the connection of each component of the system does not affect any behavioral characteristics of a component; therefore, knowing the shock response function of all components, you should be able to get all the behaviors of the entire s...

AI Technical Summary

Problems solved by technology

In order to realize the above functions, if there is no unified standard time in the whole electric power system, or the clock errors of each subsystem are large, unreasonable conclusions or misunderstandings will inevitably be produced

[0005] The WESDAC-32EMS energy management system installed and put into operation in 1988 by the General Commissioner of the North China Power Grid adopted a Philips clock system with a nominal accuracy of 1 ns. The operating clock error is considerable, and the operation and maintenance personnel have to refer to a standard clock for regular manual calibration, so it can only meet the time accuracy requirements in the master station system, and cannot play the role of standard time in the entire system of the North China Power Grid

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